Never wake up to cold floors again! Suitable for nearly every type of floor covering, UnderFloor Series heating mats provide comfortable flooring temperatures to existing floors without having to replace the floor coverings. Covering 21.3333 square feet, the SunTouch 1201616U2ST UnderFloor Heating Mat is an affordable way to add comfort and warmth to your home. Installed between floor joists, the 1201616U2ST UnderFloor Heating Mat is designed for use under a wooden subfloor. Designed to deliver 10 watts per square foot, UnderFloor mats provide warmth to much needed flooring areas.